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Pet any cats or dogs lately?
Flea medication can wipe out inverts exactly as you've described.
I wouldn't rule out something being sprayed outside and coming in through the window, either. What about your apartment management? Would they be applying pesticide around the building?
Jekerry, the danger with keeping a magnet in the tank is if the magnet seal is damaged and the metal is exposed to rank water. That said, there have been lots of cases of people finding old rusty magnets in their system and no damage done. It probably depends on the type of magnet and any plating on it. Iron itself is definitely not dangerous in reasonable concentrations.
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Inconveniencing marine life since 1992
"It is my personal belief that reef aquaria should be thriving communities of biodiversity, representative of their wild counterparts, and not merely collections of pretty specimens growing on tidy clean rock shelves covered in purple coralline algae." (Eric Borneman)
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